<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>购买</title>
</head>
<body>
    <form action="buy" method="post">
        货品：<select name="product">
            <option value="鼠标">鼠标</option>
            <option value="光盘">光盘</option>
            <option value="手机">手机</option>
        </select><br /> 
        数量：<input type="text" name="number" /><br /> 
        <input type="submit" value="购买" />
    </form>
</body>
</html>